Hi,
Reading this thread, it asked for information on the Vilis Subsector. But commentary has centered on the abilities of the ship with almost no comment on the Subector worlds. I will not be commenting on the ship because it is the Game Master's game and the ship is what they decide it is.
That said,
Many worlds in the Vilis subsector were explored and settled by the Sword World with limited exploration/colonization until Imperial explorers reached the region. A good number of worlds claimed by the Sword Worlds were then absorbed by the Imperium. Mostly by the request of those world populations. Despite that, this remains a point of contention between Imperial and Sword Worlds governments.
When it comes to Imperial Authority in the region, the Imperial worlds in the Sector are under the Imperial Government or Emerperor Strephon Aella Alkhalikoi. But his Court, on Capital, is so remote that the local governments need to operate on their own "in compliance with" the laws of the Third Imperium.
The Sector itself, depending on your time frame(and which version of the game you are playing) ha a capital in the Mora system, from which The Spinward Marches Sector government rules, under the Sector Senate. In much of the released Traveller data, the sector is also the fief of Grand Imperial Duchess Delphine Adorania Muudashir. Later in published material you either see Delphine step down in favor of her heir, Dame Elane Shankarr Muudashir, C.E.G or you see the Civil War and Virus and the surviving Imperial worlds in the sector become part of the Regency under Arch Duke Norris Aella Aledon.
Again, the administration of the region is months from Mora one way and far enough from Regina that administration still needs to be more local. The Vilis sector is also important enough to the defense of the Imperial border that it warrants a local Duchy. The Vilis Duchy is the Fief of Duke Bondal a'Plena. While he is known as "The Duke of Vilis", his Court is actually located on the Subsector capital in the Frenzie system.
The subsector maintains an important communications link along the border to Regina from Garda-Vilis(but not yet including Vilis). These worlds are "shield worlds" in the Pre-Fifth Frontier War defensive strategy against invasion from the Sword Worlds(Via Margesi system or directly from SW worlds) or across the abyss from Zhodani or non-aligned worlds.
Margesi was settled from the Gram system by the Sworld Worlders in -186 (third Imperium) and named originally named Isenfang, the name for Gríðarvöl ("Gríðr's staff") in the ancient literature of Terra,
Moving Coreward along the Vilis trace, you come to Vilis, which had been settled by the sworld worlders as "Svavasorm", and was settled from Gungnir (which had been "Morglay") in 249 (Third Imperium). Vilis had been the original capital of the subsector but was moved as a result of Imperial military losses over the Frontier Wars.
Continuing Coreward, the next major world is Garda-Vilis, settled by the Sacnoth Dominateand initially named "Tanoose". There is a low-grade terror organization called the "Tanoose Freedom League" who fight to gain home rule and re-name their world "Tanoose" again. Despite their actions, they are very loyal to the Third Imperium and have acted against Ine Givar terrorists when they tried to gain an alliance before the Fifth Frontier War. Garda-Vilis is currently administered from Vilis. Garda-Vilis has an Imperial Scout base in-system.
Continuing Coreward, you reach the Frenzie system, and home of the Capital and Court of Bondal a'Plena, Duke of the Vilis subsector. There is also a fairly large and powerful naval base orbiting the vacuum world of Frenzie. Ruling locally under Duke a'Plena is Canter Mavraii, the Marquis Frenzie. While the Duke holds a duchie and the subsector as fiefs, Canter Mavraii hols the world of Frenzie as fief, and owes fealty to Duke a'Plena, then to Duchess Delphine. Frenzie has a naval
Next, you go coreward by trailing to the Mirriam system(one of two so named systems in the Marches with the other "Mirriam" in the Five Sisters subsctor) Mirriam is an unremarkable world settled by a isolationist colonists who've developed a partial immunity to the airborne bacteria in the world’s atmosphere. The most important parts of the system are the naval base and ports supporting interstellar traffic and communications as well as defense.
Continuing coreward by trailing, you reach the "frozen water world" of Denotam, which is largely separated into the Imperial populations centered on the high and downports while "tribal populations" control the surface. The Denotam system is the fief of a Marquis or Marquisa who has not been named in Canon.
Moving further along the trace brings you to lesser worlds outside the Imperium (due to the jump limitations of your chosen ship) and then to the Regina cluster if you follow them.
Lesser worlds of the subsector break down to those inside Imperial borders or non-Imperial worlds in "the abyss" The coreward part of the subsector is the demilitarized neutral zone agreed on with the Zhodani Consulate. and the subsector's rimward edge borders on the Sword Worlds Confedration. Of course, after the Fifth Frontier War, the Sword Worlds have been partitioned into the Sword Worlds and Border worlds Confederations. And in that later time, each Confederation world is under Imperial Navy garrison. So there is a lot of coming and going with supplies and communications which opens that space to interesting adventures between supporting Imperial ships and angry occupied Sworld Worlders.
Lesser Imperial worlds include: Plume, Calit, Ficant, Tavonni, Saurus, Stellatio, Arkadia, Choleosti and 728-907 on which there is some canon written, but which I will not expand to prevent this book becoming even more of a "book".
There is also the Red-zoned world of Asgard.
You will possibly be concerned with the Plume system since it might be transited based on your discussion.
This under considerated world is primarily an agricultural society(cattle and grain) This world may be a jumping off point for your players moving into the Lanth subsector and then Rimward to your goal.
The Abyss in the subsector separates the more dense worlds of the subsector from the Lanth subsector as well as the Zhodani
Important worlds in the Abyss include Arden and Tremous Dex
Arden is an over-populated world which had been settled by unhappy settlers fleeing the Ziru Sirka(First Imperium) and so long predated other Imperial settlement in the region (as with the Sword Worlds). Arden was eventually incorporated into the Third Imperium and rose to become a regional County(IE: Ruled by a Count or Countess) and capital of "the Arden subsector". As a result of the Third Frontier War, the Imperial border was pushed back and the County of Arden made independent. The Subsector was moved back and the subsector was renamed the Vilis Subsector. Arden was the main site of negotiations between Imperial and Zhodani govenrments until those were relocated to the Quar system, but remains (like Hong Cong was before China took it over) a hotbed of intrigue and spies, smugglers, etc...
During the period before the war, Arden had settled both Utoland and Zircon, and Utoland largely became able to operate independant of the mother world. Zircon never did. After becoming independent, Arden announced, "The Federation of Arden", but that polity did not last long. Maintaining their independence and neutrality through the Fourth and Fifth Frontier Wars, Arden is now again expanding and started expanding again after the Fifth Frontier War. over time, it will include the systems: Zenopit, Zircon, Utoland, Pequan, Tremous Dex, Digitias, Edinina, and Quare(not to be confused with the Quar system)
Tremous Dex is important before the above absorption by Arden because it is largely a pirate world or "Tortuga port", where raiders can establish bases while raiding near by Imperial worlds including some of those systems your players might travel through. Because there is little written about Tremous Dex, with some more written about Arden, you may want to read my work on those systems for my Traveller game (detailed via the History page on my website:
www.usedstarships.com) My players have just spent some time traveling to Arden via Tremous Dex on a mission they were assigned.
Lesser worlds of the Vilis abyss which I will not much cover here include the red-zoned Zeta2, Quare, Edinina, 899-076, Digitis, Rangent, Tionale and Caloran. The 728-907 system is noted because a recent survey of this large inhabitable world showed no evidence of higher animal life but extensive forestation and insect presence. So, the Ministry of Colonization has earmarked the world for seeding within the next century, in preparation for colonization based on the availability of personnel and funds.